Passive (active) preamplifier with selector (motorized ALPS, IR) - diyAudio
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Old 6th February 2011, 09:24 AM   #1
veteran is offline veteran  Poland
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Default Passive (active) preamplifier with selector (motorized ALPS, IR)

I was thinking about input selector board for quite some time as a supplement to PVC (passive volume controller) project and finally I found some time to complete it.

Its a 4 input and 2 output selector. Im using two relays for each channel separate for signal and ground (second one can be replaced by jumper). There is also place for power supply that can be used to power the relays (for standalone selector or higher voltage relays).

I also redesigned my motorized ALPS potentiometer controller to work with this board this combination gave a complete passive preamp with volume control, selector and some additional features:
- PCB with backlighted buttons (4 inputs, 2 outputs, mute)
- ability to connect infrared remote control (that cal learn every RC5 remote commands)
- connector for ON / OFF (backlighted) button
- two additional channels capable to drive relays (one of them for ON/OFF relay)
- mute and monitor functions

As You can see potentiometer PCB was separated from the selector so I can connect any external preamplifier (such as Aleph 1.7, tube), buffer, etc.

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Old 14th February 2011, 11:43 AM   #2
guik is offline guik  France
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Any news ? I'm very interested by such a preamp
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Old 17th February 2011, 06:16 PM   #3
veteran is offline veteran  Poland
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The project and software are ready - all components works fine. Now I'm looking for good enclosure If there will be several people interested I can order more boards and maybe some components.
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Old 20th February 2011, 06:26 PM   #4
veteran is offline veteran  Poland
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I also found some time to connect my selector with volume control based on relays

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Old 23rd February 2011, 01:51 PM   #5
Peng is offline Peng  Netherlands
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That looks really nice ! I'm interested.
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Old 26th February 2011, 10:37 AM   #6
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I can order more boards for this project if anyone is interested. The cost of one set will be around $25 (gold plated). You also need a programmed microcontroller.
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Old 27th February 2011, 10:20 PM   #7
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Quote:
Originally Posted by veteran View Post
I can order more boards for this project if anyone is interested. The cost of one set will be around $25 (gold plated). You also need a programmed microcontroller.
I'm interested in some boards. Also maybe interested in some of the relay based volume control boards if they exist. Hopefully shipping is not cost prohibitive to the US. Should be OK for just PCB's I think. Also, I can program the MCU myself if you can send the binary after the boards are available...

please do let me know if this happens...
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Old 28th February 2011, 10:31 AM   #8
Peng is offline Peng  Netherlands
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Hi Veteran, do you see a possibility to include the programmed microcontroller ?
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Old 9th March 2011, 10:11 AM   #9
veteran is offline veteran  Poland
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Yes. I can even create a full (maybe without potentiometer) set/kit of elements needed to build this selector. Let me know if you are interested in such group buy.
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Old 10th March 2011, 10:12 AM   #10
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Yes. I can even create a full (maybe without potentiometer) set/kit of elements needed to build this selector. Let me know if you are interested in such group buy.
I would like one of those .. count me in ..
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